t disable NAT in Firewall > NAT, Outbound
Either set to hybrid mode and create a NO NAT rule for the source addresses you do not want to NAT or set manual mode and delete/disable the rules for the source addresses you do not want t

So if nat is disabled then the only way for trafic to go out is use routing table ?

if manual mode is set then is it possible to not NAT Traffic only for few destination IP addresses/subnets and nat for all other ?